Description: Material: Metal cold rolled steel, plastic ABS. Directly fixed don't need to glue. With 4 screws, directly fixed, easy to install. DIY speaker grille, suitable for DIY speakers and cars speaker decorative circle. Outer Diameter: :184mm, Diagonal Screws Spacing: 167mm, Inner Diameter: 145mm Package Includes: 1 Piece Black Speaker Decorative Circle 4 Pieces screws